-- Sensitivity to SNS-595 is related to activation of double strand DNA

break repair pathways including homologous recombination

[Abstract #1859]

SNS-595 is a novel naphthyridine analog, structurally related to
quinolones, a class of compounds which has not been used previously in the
treatment of cancer.

About Sunesis Pharmaceuticals

Sunesis is a clinical-stage biopharmaceutical company focused on the
discovery, development and commercialization of novel small molecule
therapeutics for oncology and other serious diseases. Sunesis has built a
broad product candidate portfolio through internal discovery and
in-licensing of novel cancer therapeutics. Sunesis is advancing its product
candidates through in-house research and development efforts and strategic
collaborations with leading pharmaceutical and biopharmaceutical companies.
For additional information on Sunesis Pharmaceuticals, please visit
http://www.sunesis.com.

SUNESIS and the logo are trademarks of Sunesis Pharmaceuticals, Inc.

Safe Harbor Statement

This press release contains forward-looking statements including
without limitation statements related to the potential efficacy, mechanism
of action and benefits of SNS-595, and the potential for SNS-595 to be
tested in other indications. Words such as "may," "potential," "could" '/>"/>

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